When I plug the autoguder port in, the dec drive immediately start slewing to the west non-stop.

Yup - that's what that setup will do, all right (except that it can't slew to the West in DEC; DEC moves North and South). You aren't using an ST-4 so you shouldn't be using an ST-4 cable. The Shoestring unit requires a different guide cable (pin 1 to pin 1) from the SBIG cable (which is pin 1 to pin 6). With a Tak mount the easy thing to do is to use the Shoestring-supplied cable with a Tak adaptor (also from Shoestring) and forget about the Tak-supplied guide cable, which is compatible only with SBIG cameras.

I was just reading on the Tak users group and found out the st-4 cable that my friend gave me along with the tak is NOT campatible with anything but the SBIG!! So just ordered the tak adapter from shoestring.